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  • 如何识别矩形圆形面积,我识别圆形有时候会打印矩形,怎么更改一下。



    • import sensor, image, time
      from pyb import UART
      import json
      
      black_threshold = (0, 20, -18, 127, -8, 22)      #black
      green_threshold = (0, 70, -128, -28, 22, 127)  #green
      red_threshold =   (0, 50, -128, 127, 12, 127) #red
      
      sensor.reset()
      sensor.set_pixformat(sensor.RGB565)
      sensor.set_framesize(sensor.QQVGA)
      sensor.skip_frames(time = 2000)
      sensor.set_auto_gain(False) # must be turned off for color tracking
      sensor.set_auto_whitebal(False) # must be turned off for color tracking
      clock = time.clock()
      while(True):
          clock.tick()
          img = sensor.snapshot()
      #识别形状颜色
          for c in img.find_circles(threshold = 3500, x_margin = 10, y_margin = 10, r_margin = 10,r_min = 2, r_max = 100, r_step = 2):
              img.draw_circle(c.x(), c.y(), c.r(), color = (255, 0, 0))
      
              output_str="[%d,%d,%d]" % (c.x(),c.y(),c.r())
              print("形状:圆形",output_str)
              uart.write(output_str+'\r\n')
      
              statistics=img.get_statistics(roi = (c.r(),  c.r(), 2 * c.r(), 2 * c.r()))
              blobs = img.find_blobs([red_threshold,green_threshold,black_threshold],roi=(c.r(),  c.r(), 2 * c.r(), 2 * c.r()))
              if blobs:
                  max_blob = find_max(blobs)
                  img.draw_rectangle(max_blob[0:4]) # rect
                  img.draw_cross(max_blob[5], max_blob[6]) # cx, cy
      
              else:
                   pass
          for r in img.find_rects(threshold = 10000):
              img.draw_rectangle(r.rect(), color = (255, 0, 0))
              output_str="[%d,%d,%d,%d]" % (r.x(),r.y(),r.w(),r.h())
              print("形状:矩形",output_str)
              uart.write(output_str+'\r\n')
      
              area = r.rect()
              blobs = img.find_blobs([red_threshold,green_threshold,black_threshold],roi=area)
              if blobs:
                  max_blob = find_max(blobs)
                  img.draw_rectangle(max_blob[0:4]) # rect
                  img.draw_cross(max_blob[5], max_blob[6]) # cx, cy
      
              else:
                   pass
      


    • 把所有的draw_rectangle删除,否则会影响后面的查找矩形。